Some rooms also overlook each other during the day as those at the corners of the building are at right-angles with each other.

Darren Gearing, the hotel’s general manager, said it was “familiar” with the quirks and would “deal with those as we go along”.

“In some rooms, due to the unique shape of the Shard, guests may be able to glimpse into a neighbour’s room,” he said. “For this, blinds are available for guest privacy.”

He added, delicately, that staff are “orientating guests properly” to ensure they are aware that their rooms might not be entirely private without the use of the blinds.

The hotel, which has marble-clad bathrooms with heated floors across all rooms, opened last Tuesday.

However only around a quarter of the 202 rooms were ready, with the remainder yet to be completed.

Ray Anderson, 56, from Cambridge, who was one of the first guests, along with his wife, heaped praise on the hotel, but added: “You just have to remember to turn the lights off at night to avoid being spied on.”